Sorta OT - assistive technology assistance needed

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Sorta OT - assistive technology assistance needed

JHRichards
Good Day.

Background:

I am assisting a blind ham who also suffers some hearing loss.  I
suggested using headphones to attenuate ambient environmental noise as
he operates.  The rub is, he needs to hear both his receiver AND his
computer (which provides audible feedback when logging contacts and
performing other duties.)

Question:

Can anyone suggest a simple passive (or active) mixer circuit schema I
can build for him to safely mix audio signals from his transceiver
headphone jack with audio signals from his computer sound card headphone
jack?

Discussion:

While there are multiple commercially produced simple and complex mixing
products in the marketplace, I would prefer to build an inexpensive,
small footprint solution we can easily incorporate in his station to
minimize clutter and the number of cables, jacks, and controls -- he
contends with plenty of that already.   I suppose one solution might be
a simple Y-adapter cable, but that seems too easy and I wonder whether
we should isolate the signals and/or grounds in some way?  (e.g., I do
not wish to cause any "Pin-1" grounding issues, and etc.)

Any traction?   Can anyone point me to an appropriate circuit schematic
or other resource?  I don 't mind doing homework, and while I enjoy
building stuff and I am familiar with the basic concepts involved,  I
could use a leg up on this project, especially to keep it simple and
easy to build and implement. Please reply off list if this question is
too far off topic, although I suspect there are many hams who might be
interested in the result, besides similarly situated disabled operators.

Thank you -  James - K8JHR -
---------------------------------------




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Re: Sorta OT - assistive technology assistance needed

Bill K9YEQ
Feed the receiver audio into the Computer and use it to mix the signals.  

73,
Bill
K9YEQ

https://wrj-tech.com/

-----Original Message-----
From: [hidden email] <[hidden email]> On Behalf Of Richards
Sent: Wednesday, January 9, 2019 5:03 PM
To: [hidden email]
Subject: [Elecraft] Sorta OT - assistive technology assistance needed

Good Day.

Background:

I am assisting a blind ham who also suffers some hearing loss.  I suggested using headphones to attenuate ambient environmental noise as he operates.  The rub is, he needs to hear both his receiver AND his computer (which provides audible feedback when logging contacts and performing other duties.)

Question:

Can anyone suggest a simple passive (or active) mixer circuit schema I can build for him to safely mix audio signals from his transceiver headphone jack with audio signals from his computer sound card headphone jack?

Discussion:

While there are multiple commercially produced simple and complex mixing products in the marketplace, I would prefer to build an inexpensive, small footprint solution we can easily incorporate in his station to minimize clutter and the number of cables, jacks, and controls -- he contends with plenty of that already.   I suppose one solution might be a simple Y-adapter cable, but that seems too easy and I wonder whether we should isolate the signals and/or grounds in some way?  (e.g., I do not wish to cause any "Pin-1" grounding issues, and etc.)

Any traction?   Can anyone point me to an appropriate circuit schematic or other resource?  I don 't mind doing homework, and while I enjoy building stuff and I am familiar with the basic concepts involved,  I could use a leg up on this project, especially to keep it simple and easy to build and implement. Please reply off list if this question is too far off topic, although I suspect there are many hams who might be interested in the result, besides similarly situated disabled operators.

Thank you -  James - K8JHR -
---------------------------------------




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Sorta OT - assistive technology assistance needed

ANDY DURBIN
In reply to this post by JHRichards
"Any traction?   Can anyone point me to an appropriate circuit schematic
or other resource? "

You don't mention what rig is being used.  Many modern rigs provide a USB port for use with a PC.  This USB port typically provides an audio as well as a CAT interface.   With such a rig, mixing PC sounds with rig audio requires setting the rig CODEC audio properties to "listen to this device" and adjusting the audio balance with the volume mixer.   The only hardware required is one USB A/B cable.

If you do this - Please don't allow the rig's audio CODEC to be the PC's default sound playback device!

Andy, k3wyc


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Re: Sorta OT - assistive technology assistance needed

W2xj
In reply to this post by JHRichards
Without knowing more details I think levels are the biggest problem. Otherwise a simple passive mixer comprised of a few resistors would suffice.

Sent from my iPad

> On Jan 9, 2019, at 6:03 PM, Richards <[hidden email]> wrote:
>
> Good Day.
>
> Background:
>
> I am assisting a blind ham who also suffers some hearing loss.  I suggested using headphones to attenuate ambient environmental noise as he operates.  The rub is, he needs to hear both his receiver AND his computer (which provides audible feedback when logging contacts and performing other duties.)
>
> Question:
>
> Can anyone suggest a simple passive (or active) mixer circuit schema I can build for him to safely mix audio signals from his transceiver headphone jack with audio signals from his computer sound card headphone jack?
>
> Discussion:
>
> While there are multiple commercially produced simple and complex mixing products in the marketplace, I would prefer to build an inexpensive, small footprint solution we can easily incorporate in his station to minimize clutter and the number of cables, jacks, and controls -- he contends with plenty of that already.   I suppose one solution might be a simple Y-adapter cable, but that seems too easy and I wonder whether we should isolate the signals and/or grounds in some way?  (e.g., I do not wish to cause any "Pin-1" grounding issues, and etc.)
>
> Any traction?   Can anyone point me to an appropriate circuit schematic or other resource?  I don 't mind doing homework, and while I enjoy building stuff and I am familiar with the basic concepts involved,  I could use a leg up on this project, especially to keep it simple and easy to build and implement. Please reply off list if this question is too far off topic, although I suspect there are many hams who might be interested in the result, besides similarly situated disabled operators.
>
> Thank you -  James - K8JHR -
> ---------------------------------------
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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Re: Sorta OT - assistive technology assistance needed

Don Wilhelm
In reply to this post by JHRichards
James,

There was a homebrew headphone mixer in the ARRL Handbook sometime back
- simple, with op-amps to isolate the sources.

However with the advent of 2 to 5 input mixers being available in the
$20 to $60 range (see Amazon), it seems foolish to consider building
your own - drilling the enclosure for the potentiometers and jacks,
building the board, mounting things, etc. will take more time and effort
than is reasonable unless you really like doing those things - and it
will likely cost more than buying one already built.

The nice thing about a mixer is that you have control over the level of
each input as well as an overall output volume control.

73,
Don W3FPR

On 1/9/2019 6:03 PM, Richards wrote:

> Good Day.
>
> Background:
>
> I am assisting a blind ham who also suffers some hearing loss.  I
> suggested using headphones to attenuate ambient environmental noise as
> he operates.  The rub is, he needs to hear both his receiver AND his
> computer (which provides audible feedback when logging contacts and
> performing other duties.)
>
> Question:
>
> Can anyone suggest a simple passive (or active) mixer circuit schema I
> can build for him to safely mix audio signals from his transceiver
> headphone jack with audio signals from his computer sound card headphone
> jack?
>
> Discussion:
>
> While there are multiple commercially produced simple and complex mixing
> products in the marketplace, I would prefer to build an inexpensive,
> small footprint solution we can easily incorporate in his station to
> minimize clutter and the number of cables, jacks, and controls -- he
> contends with plenty of that already.   I suppose one solution might be
> a simple Y-adapter cable, but that seems too easy and I wonder whether
> we should isolate the signals and/or grounds in some way?  (e.g., I do
> not wish to cause any "Pin-1" grounding issues, and etc.)
>
> Any traction?   Can anyone point me to an appropriate circuit schematic
> or other resource?  I don 't mind doing homework, and while I enjoy
> building stuff and I am familiar with the basic concepts involved,  I
> could use a leg up on this project, especially to keep it simple and
> easy to build and implement. Please reply off list if this question is
> too far off topic, although I suspect there are many hams who might be
> interested in the result, besides similarly situated disabled operators.
>
> Thank you -  James - K8JHR -
> ---------------------------------------
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
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Re: Sorta OT - assistive technology assistance needed

Dave Fugleberg
I usually like to build stuff when I can, but I have to agree with the
others who suggested a commercial mixer. They are cheap and work well.
I recently bought a small behringer USB mixer for under 50 bucks for a
project at work. It acts as a USB sound card, so you can mix audio to or
from the PC with other sources. You can adjust levels, equalization, and
position (left/right) for each source.
I doubt one could homebrew an equivalent unit any cheaper.
Good luck with your project! I’m sure your friend will appreciate it.

On Wed, Jan 9, 2019 at 5:30 PM Don Wilhelm <[hidden email]> wrote:

> James,
>
> There was a homebrew headphone mixer in the ARRL Handbook sometime back
> - simple, with op-amps to isolate the sources.
>
> However with the advent of 2 to 5 input mixers being available in the
> $20 to $60 range (see Amazon), it seems foolish to consider building
> your own - drilling the enclosure for the potentiometers and jacks,
> building the board, mounting things, etc. will take more time and effort
> than is reasonable unless you really like doing those things - and it
> will likely cost more than buying one already built.
>
> The nice thing about a mixer is that you have control over the level of
> each input as well as an overall output volume control.
>
> 73,
> Don W3FPR
>
> On 1/9/2019 6:03 PM, Richards wrote:
> > Good Day.
> >
> > Background:
> >
> > I am assisting a blind ham who also suffers some hearing loss.  I
> > suggested using headphones to attenuate ambient environmental noise as
> > he operates.  The rub is, he needs to hear both his receiver AND his
> > computer (which provides audible feedback when logging contacts and
> > performing other duties.)
> >
> > Question:
> >
> > Can anyone suggest a simple passive (or active) mixer circuit schema I
> > can build for him to safely mix audio signals from his transceiver
> > headphone jack with audio signals from his computer sound card headphone
> > jack?
> >
> > Discussion:
> >
> > While there are multiple commercially produced simple and complex mixing
> > products in the marketplace, I would prefer to build an inexpensive,
> > small footprint solution we can easily incorporate in his station to
> > minimize clutter and the number of cables, jacks, and controls -- he
> > contends with plenty of that already.   I suppose one solution might be
> > a simple Y-adapter cable, but that seems too easy and I wonder whether
> > we should isolate the signals and/or grounds in some way?  (e.g., I do
> > not wish to cause any "Pin-1" grounding issues, and etc.)
> >
> > Any traction?   Can anyone point me to an appropriate circuit schematic
> > or other resource?  I don 't mind doing homework, and while I enjoy
> > building stuff and I am familiar with the basic concepts involved,  I
> > could use a leg up on this project, especially to keep it simple and
> > easy to build and implement. Please reply off list if this question is
> > too far off topic, although I suspect there are many hams who might be
> > interested in the result, besides similarly situated disabled operators.
> >
> > Thank you -  James - K8JHR -
> > ---------------------------------------
> >
> >
> >
> >
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> > Message delivered to [hidden email]
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
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Re: Sorta OT - assistive technology assistance needed

Gary Smith-2
In reply to this post by JHRichards
Not the answer you are asking for but
still maybe a valuable idea for your
friend.

My mother was totally deaf and my father
wanted to teach her code. What he did was
disassemble & repurpose a speaker and made
an arrangement that attached to her
forearm, this connected to the audio
output. The coil moved with the CW in the
audio, that pressed against her skin and
she was able to tactile sense the CW
really well.

Maybe this will help you or someone else.

73,

Gary
KA1J


> Good Day.
>
> Background:
>
> I am assisting a blind ham who also suffers some hearing loss.  I
> suggested using headphones to attenuate ambient environmental noise as
> he operates.  The rub is, he needs to hear both his receiver AND his
> computer (which provides audible feedback when logging contacts and
> performing other duties.)
>
> Question:
>
> Can anyone suggest a simple passive (or active) mixer circuit schema I
> can build for him to safely mix audio signals from his transceiver
> headphone jack with audio signals from his computer sound card
> headphone jack?
>
> Discussion:
>
> While there are multiple commercially produced simple and complex
> mixing products in the marketplace, I would prefer to build an
> inexpensive, small footprint solution we can easily incorporate in his
> station to minimize clutter and the number of cables, jacks, and
> controls -- he contends with plenty of that already.   I suppose one
> solution might be a simple Y-adapter cable, but that seems too easy
> and I wonder whether we should isolate the signals and/or grounds in
> some way?  (e.g., I do not wish to cause any "Pin-1" grounding
> issues, and etc.)
>
> Any traction?   Can anyone point me to an appropriate circuit
> schematic or other resource?  I don 't mind doing homework, and while
> I enjoy building stuff and I am familiar with the basic concepts
> involved,  I could use a leg up on this project, especially to keep
> it simple and easy to build and implement. Please reply off list if
> this question is too far off topic, although I suspect there are many
> hams who might be interested in the result, besides similarly situated
> disabled operators.
>
> Thank you -  James - K8JHR -
> ---------------------------------------
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]



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Re: Sorta OT - assistive technology assistance needed

W2xj
In reply to this post by Dave Fugleberg
if the levels were close, 6 resistors costing pennies would do the job. No case or machining necessary.

Sent from my iPad

> On Jan 9, 2019, at 8:42 PM, Dave Fugleberg <[hidden email]> wrote:
>
> I usually like to build stuff when I can, but I have to agree with the
> others who suggested a commercial mixer. They are cheap and work well.
> I recently bought a small behringer USB mixer for under 50 bucks for a
> project at work. It acts as a USB sound card, so you can mix audio to or
> from the PC with other sources. You can adjust levels, equalization, and
> position (left/right) for each source.
> I doubt one could homebrew an equivalent unit any cheaper.
> Good luck with your project! I’m sure your friend will appreciate it.
>
>> On Wed, Jan 9, 2019 at 5:30 PM Don Wilhelm <[hidden email]> wrote:
>>
>> James,
>>
>> There was a homebrew headphone mixer in the ARRL Handbook sometime back
>> - simple, with op-amps to isolate the sources.
>>
>> However with the advent of 2 to 5 input mixers being available in the
>> $20 to $60 range (see Amazon), it seems foolish to consider building
>> your own - drilling the enclosure for the potentiometers and jacks,
>> building the board, mounting things, etc. will take more time and effort
>> than is reasonable unless you really like doing those things - and it
>> will likely cost more than buying one already built.
>>
>> The nice thing about a mixer is that you have control over the level of
>> each input as well as an overall output volume control.
>>
>> 73,
>> Don W3FPR
>>
>>> On 1/9/2019 6:03 PM, Richards wrote:
>>> Good Day.
>>>
>>> Background:
>>>
>>> I am assisting a blind ham who also suffers some hearing loss.  I
>>> suggested using headphones to attenuate ambient environmental noise as
>>> he operates.  The rub is, he needs to hear both his receiver AND his
>>> computer (which provides audible feedback when logging contacts and
>>> performing other duties.)
>>>
>>> Question:
>>>
>>> Can anyone suggest a simple passive (or active) mixer circuit schema I
>>> can build for him to safely mix audio signals from his transceiver
>>> headphone jack with audio signals from his computer sound card headphone
>>> jack?
>>>
>>> Discussion:
>>>
>>> While there are multiple commercially produced simple and complex mixing
>>> products in the marketplace, I would prefer to build an inexpensive,
>>> small footprint solution we can easily incorporate in his station to
>>> minimize clutter and the number of cables, jacks, and controls -

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Re: Sorta OT - assistive technology assistance needed

Charlie T, K3ICH
In reply to this post by Dave Fugleberg
Hmmm,  and here I thought it meant "Old Timer", since that really relates to me.
Of course, "Off Topic "does too

Chas


-----Original Message-----
From: [hidden email] <[hidden email]> On Behalf Of Walter Underwood
Sent: Wednesday, January 09, 2019 11:59 PM
To: [hidden email]
Subject: Re: [Elecraft] Sorta OT - assistive technology assistance needed

Funny, I just realized I was misreading “OT” as Occupational Therapy. Our son just finished OT grad school and is studying for the board. Of course, assistive tech is a big part of occupational therapy.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jan 9, 2019, at 5:42 PM, Dave Fugleberg <[hidden email]> wrote:
>
> I usually like to build stuff when I can, but I have to agree with the
> others who suggested a commercial mixer. They are cheap and work well.
> I recently bought a small behringer USB mixer for under 50 bucks for a
> project at work. It acts as a USB sound card, so you can mix audio to
> or from the PC with other sources. You can adjust levels,
> equalization, and position (left/right) for each source.
> I doubt one could homebrew an equivalent unit any cheaper.
> Good luck with your project! I’m sure your friend will appreciate it.
>
> On Wed, Jan 9, 2019 at 5:30 PM Don Wilhelm <[hidden email]> wrote:
>
>> James,
>>
>> There was a homebrew headphone mixer in the ARRL Handbook sometime
>> back
>> - simple, with op-amps to isolate the sources.
>>
>> However with the advent of 2 to 5 input mixers being available in the
>> $20 to $60 range (see Amazon), it seems foolish to consider building
>> your own - drilling the enclosure for the potentiometers and jacks,
>> building the board, mounting things, etc. will take more time and
>> effort than is reasonable unless you really like doing those things -
>> and it will likely cost more than buying one already built.
>>
>> The nice thing about a mixer is that you have control over the level
>> of each input as well as an overall output volume control.
>>
>> 73,
>> Don W3FPR
>>
>> On 1/9/2019 6:03 PM, Richards wrote:
>>> Good Day.
>>>
>>> Background:
>>>
>>> I am assisting a blind ham who also suffers some hearing loss.  I
>>> suggested using headphones to attenuate ambient environmental noise
>>> as he operates.  The rub is, he needs to hear both his receiver AND
>>> his computer (which provides audible feedback when logging contacts
>>> and performing other duties.)
>>>
>>> Question:
>>>
>>> Can anyone suggest a simple passive (or active) mixer circuit schema
>>> I can build for him to safely mix audio signals from his transceiver
>>> headphone jack with audio signals from his computer sound card
>>> headphone jack?
>>>
>>> Discussion:
>>>
>>> While there are multiple commercially produced simple and complex
>>> mixing products in the marketplace, I would prefer to build an
>>> inexpensive, small footprint solution we can easily incorporate in
>>> his station to minimize clutter and the number of cables, jacks, and controls -- he
>>> contends with plenty of that already.   I suppose one solution might be
>>> a simple Y-adapter cable, but that seems too easy and I wonder
>>> whether we should isolate the signals and/or grounds in some way?  
>>> (e.g., I do not wish to cause any "Pin-1" grounding issues, and
>>> etc.)
>>>
>>> Any traction?   Can anyone point me to an appropriate circuit schematic
>>> or other resource?  I don 't mind doing homework, and while I enjoy
>>> building stuff and I am familiar with the basic concepts involved,  
>>> I could use a leg up on this project, especially to keep it simple
>>> and easy to build and implement. Please reply off list if this
>>> question is too far off topic, although I suspect there are many
>>> hams who might be interested in the result, besides similarly situated disabled operators.
>>>
>>> Thank you -  James - K8JHR -
>>> ---------------------------------------
>>>
>>>
>>>
>>>
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:[hidden email]
>>>
>>> This list hosted by: http://www.qsl.net Please help support this
>>> email list: http://www.qsl.net/donate.html Message delivered to
>>> [hidden email]
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net Please help support this
>> email list: http://www.qsl.net/donate.html Message delivered to
>> [hidden email]
> ______________________________________________________________
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>
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> list: http://www.qsl.net/donate.html Message delivered to
> [hidden email]

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Re: Sorta OT - assistive technology assistance needed

gt-i
In reply to this post by JHRichards
James,
a widely used design is to wire the sources together via some resistors,
and get some gain by a following OP-amp. The resistors could be made as
pots to adjust volume.
I built one for my guitar amp, if you look into DIY guitar electronics
you'll find plenty of design ideas.
here is mine:
https://www.log49.com/index.php?/archives/18-For-my-guitar-Pre-Amp,-Effect-and-Mixer.html

Note that you may have to add some extra capacitors to block RF, not all
readily available mixer boxes pay attention to that, really.

73 Gernot DF5RF

Am 10.01.2019 um 00:03 schrieb Richards:

> Good Day.
>
> Background:
>
> I am assisting a blind ham who also suffers some hearing loss.  I
> suggested using headphones to attenuate ambient environmental noise as
> he operates.  The rub is, he needs to hear both his receiver AND his
> computer (which provides audible feedback when logging contacts and
> performing other duties.)
>
> Question:
>
> Can anyone suggest a simple passive (or active) mixer circuit schema I
> can build for him to safely mix audio signals from his transceiver
> headphone jack with audio signals from his computer sound card
> headphone jack?
>
> Discussion:
>
> While there are multiple commercially produced simple and complex
> mixing products in the marketplace, I would prefer to build an
> inexpensive, small footprint solution we can easily incorporate in his
> station to minimize clutter and the number of cables, jacks, and
> controls -- he contends with plenty of that already.   I suppose one
> solution might be a simple Y-adapter cable, but that seems too easy
> and I wonder whether we should isolate the signals and/or grounds in
> some way?  (e.g., I do not wish to cause any "Pin-1" grounding issues,
> and etc.)
>
> Any traction?   Can anyone point me to an appropriate circuit
> schematic or other resource?  I don 't mind doing homework, and while
> I enjoy building stuff and I am familiar with the basic concepts
> involved,  I could use a leg up on this project, especially to keep it
> simple and easy to build and implement. Please reply off list if this
> question is too far off topic, although I suspect there are many hams
> who might be interested in the result, besides similarly situated
> disabled operators.
>
> Thank you -  James - K8JHR -
> ---------------------------------------
>
>
>
>
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Re: Sorta OT - assistive technology assistance needed

Bob N3MNT
Quick and dirty solution is to use PC out to one channel of stereo headphones
and radio out to the other channel.  Then if needed amplify via small low
cost stereo amp.




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